AFAIK, "Text" is the preferred type attribute. (It used to be "Start", but, IIRC, the use of this attribute is deprecated.)
If you generated the book from an ePub with Kindle Preview, this is most likely a Kindle Previewer bug. If you generated the Kindle book as usual in Calibre, it might be a Calibre bug. You may want to download Kindle for PC for testing purposes. If the book shows only one working Beginning entry in the Go menu of Kindle for PC, you can ignore this issue. (Kindle devices can only have one Go to Beginning entry anyway no matter how many "Text" attributes you used.)
If not, please answer the following questions:
1. Which Kindle Previewer version did you use?
2. Did you generate the Kindle book with Kindle Previewer or Calibre?
3. What was the version of the tool that you used?
BTW, you can delete the title-page guide item, because it'll be ignored by Kindle Previewer/KindleGen and most ePub readers.
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